The Umbrella dance !

Articles Required: An umbrella with a "U" handle, a bottle in which umbrella handle can be inserted, string and a piece of chalk.

First rub the chalk on the string. Tie this string loosely to two points of opposite walls of a room. Now insert the umbrella handle in the bottle," and try to balance the bottle on this string. Once you've found the balancing point, your job is over. Now as you give it a light jerk it will start dancing like an acrobat—going up and down in a funny manner